mm: remove legacy install_special_mapping() code

All relevant architectures had already been converted to the new interface
(which just has an underscore in front of the name - not very imaginative
naming), this just force-converts the stragglers.

The modern interface is almost identical to the old one, except instead of
the page pointer it takes a "struct vm_special_mapping" that describes the
mapping (and contains the page pointer as one member), and it returns the
resulting 'vma' instead of just the error code.

Getting rid of the old interface also gets rid of some special casing,
which had caused problems with the mremap extensions to "struct
vm_special_mapping".

[[email protected]: coding-style cleanups]
Link: https://lkml.kernel.org/r/CAHk-=whvR+z=0=0gzgdfUiK70JTa-=+9vxD-4T=3BagXR6dciA@mail.gmail.comTested-by: Rob Landley <[email protected]> # arch/sh/
Link: https://lore.kernel.org/all/20240819195120.GA1113263@thelio-3990X/
Signed-off-by: Linus Torvalds <[email protected]>
Cc: Nathan Chancellor <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Anton Ivanov <[email protected]>
Cc: Brian Cain <[email protected]>
Cc: Christophe Leroy <[email protected]>
Cc: Dinh Nguyen <[email protected]>
Cc: Guo Ren <[email protected]>
Cc: Jeff Xu <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: John Paul Adrian Glaubitz <[email protected]>
Cc: Liam R. Howlett <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Cc: Pedro Falcato <[email protected]>
Cc: Richard Weinberger <[email protected]>
Cc: Rich Felker <[email protected]>
Cc: Rob Landley <[email protected]>
Cc: Yoshinori Sato <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

1 files changed, 8 insertions, 4 deletions

diff --git a/arch/nios2/mm/init.c b/arch/nios2/mm/init.c
index 3459df28afee..a2278485de19 100644
--- a/arch/nios2/mm/init.c
+++ b/arch/nios2/mm/init.c
@@ -82,6 +82,10 @@ void __init mmu_init(void)
 pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE);
 pte_t invalid_pte_table[PTRS_PER_PTE] __aligned(PAGE_SIZE);
 static struct page *kuser_page[1];
+static struct vm_special_mapping vdso_mapping = {
+	.name = "[vdso]",
+	.pages = kuser_page,
+};
 
 static int alloc_kuser_page(void)
 {
@@ -106,18 +110,18 @@ arch_initcall(alloc_kuser_page);
 int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 {
 	struct mm_struct *mm = current->mm;
-	int ret;
+	struct vm_area_struct *vma;
 
 	mmap_write_lock(mm);
 
 	/* Map kuser helpers to user space address */
-	ret = install_special_mapping(mm, KUSER_BASE, KUSER_SIZE,
+	vma = _install_special_mapping(mm, KUSER_BASE, KUSER_SIZE,
 				      VM_READ | VM_EXEC | VM_MAYREAD |
-				      VM_MAYEXEC, kuser_page);
+				      VM_MAYEXEC, &vdso_mapping);
 
 	mmap_write_unlock(mm);
 
-	return ret;
+	return IS_ERR(vma) ? PTR_ERR(vma) : 0;
 }
 
 const char *arch_vma_name(struct vm_area_struct *vma)